Whenever a new high performance vehicle like the 2018 Dodge Challenger SRT Demon is introduced into the modern market, there is a mad scramble by the top tuning device companies to bring a product to market. For the 840-horsepower Demon, Diablosport was fittingly the first company to introduce a handheld tuning device, allowing owners to unlock far more power with the push of a button.

Diablosport Unleashes the Demon

When the 2018 Dodge Challenger SRT Demon was introduced with 840 horsepower when running on 100-octane racing fuel, the engineers weren’t shy about the fact that there would be far great power potential without the concern of emission regulations. When the team derived 840 horsepower from the supercharged 6.2-liter Demon engine, they did so while meeting all of the emission regulations put forth by federal and local governments, including California’s tough laws.

As is the case with the Hellcat cars, the Demon can provide far more power if it is tuned without the parameters of emission regulations, but doing so requires two things – an unlocked powertrain control module (PCM) and a tuning device that can make adjustments to the various inputs of the engine which lead to more power. The unlocked PCM was the simple part, but just a few months after the first Demons were delivered to owners around the country, the folks at Diablosport announced their tuning software for the most powerful production car ever offered for road use by an American automaker.

High Horse Performance Tunes the Demon

While the Diablosport inTune i3 or the Trinity 2 can provide tuning controls of the 2018 Challenger Demon PCM, the device does not come with preprogrammed engine tunes to add power. Instead, Demon owners will need a good tuning shop like High Horse Performance in Delaware to use the Diablosport device to add power on a car-by-car basis.

Fortunately, a customer of HHP’s with a new Demon brought the Diablosport tuning device into the shop for Joshua Schwartz to work his magic – and the results are solid, to say the least.


In stock form, the black Demon running on the 93-octane stock tune made 788 horsepower and 702 lb–ft of torque in the winter air. HHP then removed the catalytic convertors, added oxygenated Q16 race fuel and tuned the car to extract the most power possible. The result was 849 horsepower and 762lb-ft of torque at the rear wheels, made possible thanks to the Diablosport tuning access.

Check out the video above for a look at the Demon before and after the tune as it flexes its muscles on the dyno.